Derivative Instruments and Hedging Activities - Net Investment Hedge Gains Recognized on Consolidated Statements of Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) on net investment hedging relationships	$ 232.6	$ (295.3)	$ 58.6
Euro Notes
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) on net investment hedging relationships	129.6	(151.5)	10.7
Cross Currency Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain/(Loss) on net investment hedging relationships	$ 103.0	$ (143.8)	$ 47.9

Amount, after tax, of reclassification from accumulated other comprehensive income (AOCI) of gain (loss) from increase (decrease) in fair value of net investment hedge.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CCC
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109998896-113959

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580

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